 #dibu{
   left: 0;
    position: fixed;
    bottom: 0;
    /* top 0 就是顶部 */
    width: 100%;
    z-index: 100;
    background: #343537;
    display: flex;
    justify-content: center;
    color: #ffff;
}

#top {
 height:60px;
 background: #343537;
 color: #ffff;


}

#a_index {
 color: #ffff;
}

#content_title{
padding-top:13px;
}